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Convention (II) with Respect to the Laws and Customs of War on Land and its annex: Regulations concerning the Laws and Customs of War on Land. The Hague, 29 July 1899.
ANNEX TO THE CONVENTION : Regulations respecting the laws and customs of war on land #Section II : On hostilities #Chapter I : On means of injuring the enemy, sieges, and bombardments - Art. 23.
Art. 23. Besides the prohibitions provided by special Conventions, it is especially prohibited
(a) To employ poison or poisoned arms;
(b) To kill or wound treacherously individuals belonging to the hostile nation or army;
(c) To kill or wound an enemy who, having laid down arms, or having no longer means of defence, has surrendered at discretion;
(d) To declare that no quarter will be given;
(e) To employ arms, projectiles, or material of a nature to cause superfluous injury;
(f) To make improper use of a flag of truce, the national flag or military ensigns and uniform of the enemy, as well as the distinctive badges of the Geneva Convention;
(g) To destroy or seize the enemy's property, unless such destruction or seizure be imperatively demanded by the necessities of war.